(CNN) -- One of sport's most high-profile couples are no more.
Golf star Rory McIlroy announced Wednesday that he had broken off his engagement to tennis player Caroline Wozniacki.
The two-time major winner from Northern Ireland said the issuing of wedding invitations over the weekend had made him realize he wasn't prepared for "all that marriage entails."
McIlroy and former world No. 1 Wozniacki, from Denmark, announced their engagement via social media on New Year's Day -- but their three-year relationship is now over.
"There is no right way to end a relationship that has been so important to two people," McIlroy said in a statement reported by the UK Press Association.
"The problem is mine. The wedding invitations issued at the weekend made me realize that I wasn't ready for all that marriage entails.
"I wish Caroline all the happiness she deserves and thank her for the great times we've had.
"I will not be saying anything more about our relationship in any setting."
McIlroy, ranked 10th in the world, is currently preparing for the European Tour's flagship event -- the BMW PGA Championship at Wentworth in England.
He spoke briefly about the split at a press conference ahead of Thursday's opening round, telling reporters: "Obviously (it's) quite a difficult time for Caroline and myself.
"I think the statement really said it all this morning. It was mutual and amicable and we both thought it was the best for us, the best for both of us. Time to move on and I think I've said all that I need to say.
"Now I need to get my head into golf and concentrate on the tournament, keep myself busy and try and have a good week on the course.
"I'm not going to lie. It's going to be very difficult. But you know, at least when I get inside the ropes I can just try and concentrate on the shot at hand. But yeah, it's obviously going to be difficult."
Only on Sunday McIlroy tweeted a picture while the pair were enjoying dinner together at Nobu restaurant in Monte Carlo.
The couple, who were referred to as 'Wozzilroy' by the world's media, began dating in 2011 after meeting at a boxing match.
They had to deal with constant rumors as to their health of their relationship, which were magnified when both suffered slumps in their career during 2013.
But on January 1 they took to their respective Twitter accounts to confirm they were engaged to be married with Wozniacki saying: "Rory and I started 2014 with a bang! ... I said YES!!!!"
McIlroy captured his first major title at the U.S. Open in 2011 and followed it up by claiming the US PGA Championship the following year, but has struggled for form of late.
Wozniacki, who is yet to win a grand slam title but did top the world rankings in 2010, is preparing for the second major of the tennis season -- the French Open -- which starts on May 25.
She made her first response to the split on Twitter Thursday saying, "It's a hard time for me right now. Thanks for all the sweet messages! Happy I support Liverpool right now because I know I'll never walk alone."